It's sunny. What if it rains? Why do you smell dirt?

Have you found that the smell of earth only exists when it has just rained, and there is a smell of dust or dust? That's because the temperature of the soil rises after exposure to the sun, and the sudden cooling (that is, rain) can make the soil quickly turn into dust, and because raindrops can drive a certain airflow, dust particles are temporarily suspended in the air, so you will smell the smell of soil.

There are many things, such as sheets, furniture and so on. Because of the small area (in fact, the surface area of soil is very large), it will crack slightly in the sun and smell.